Can you elaborate a bit on the scenario? The screen shot provided seems to show two Target requests. Are they two requests from the same page or separated by a refresh? What are you looking for that should change? Unless you set up mbox3rdpartyid, Target will rely on the TNT ID to determine the user. Once a user is in a group, it will stick in that group so you would expect to stay in the A or B and not flip-flop.